I would say 19kg (43lbs) is at the heavy end of a good weight range for average GSDs.
You say his grandfather was 104lbs, that to me is huge.
Who can say how big he will be once matured, however it is really important you grow him slowly so that he doesn't get too heavy and then prone to dysplasia.
If you grow him slowly and keep him at a trim weight (rather than overweight) he will still achieve his growth genetic make-up at maturity but may be less susceptible to medical issues due to being overweight.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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Last edited by Harry and Lola; 03-07-2014 at 01:11 AM.